Current transformer TZLM-I (TZLM-1)
Also this device can be called: TZLMI, TZLM I, TZLM-1 TZLM1, TZLM 1, T3LM-I, T3LMI, T3LM I.
TZLM-I current transformer is designed to supply circuits relaying ground-fault individual lived through the transformation of a three-phase cable with any residual currents and installed on the cable.
Transformers are designed for installation in complete switchgear (KRU), can be manufactured in a plastic housing, and in the cast design (speaker).
Transformers TZLM-I have two versions of embodiment the diameter of the hole for the passage of the cable:
- diameter window TZLM-I-1 - 71 mm;
- diameter window TZLM-I-2 - 101 mm.
Rated voltage - 0.66 kV.
Rated frequency - 50 Hz.
The transformation ratio - 25/1.
A one-second thermal current - 140 A.
One minute test voltage - 3 kV.
- TZLM-I-1 - fire resistant plastic;
- TZLM-I-2 - epoxy compound.
- TZLM-I cast resin - not more than 3.3 kg;
- TZLM-I in a plastic case - not more than 2.3 kg;
- TZLM-I-1 in the plastic case - not more than 3.6 kg;
- TZLM-I-2 with cast insulation - not more than 5.2 kg.
Ability to work transformers TZLM-1 microprocessor protection BMRZ firm STC "Mechatronics" series 75J60 company «Siemens», series P 120, P 140 company «Alstom».
Transformers TZLM-1 are formed as a support structure. The yoke is made of electrical steel. The secondary winding is wound on a magnetic core. Performs the role of the primary winding three-phase cable switchgear up to 10 kV, passed through a window transformers. Home insulation between the conductors of the cable and transformer secondary winding TZLM-I provided insulated cable.
Operating conditions TZLM-I:
Height above sea level - not more than 1000 m.
Top of the ambient temperature, taking into account heat the air inside the switchgear - +50° C.
Relative humidity at +25° C - 100%.
Environment not explosive, without dust, corrosive gases and vapors at concentrations that deplete the coating metals and insulation.
Transformers operating position in space - any.
Isolation transformers in the cast version - class B and class flammability FH (GHG) 1.
Isolation transformers, manufactured in plastic case - heat resistance class Y.
Transformers TZLM-1 have a climatic version "Y", category 2.